)
br - addLayer(br,k)
}
return(br)
}
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Sep 21, 2010, at 3:49 AM, Martin wrote:
Dear all,
I have some questions concerning stacks and bricks from the raster
haven't tried this. but some variant of this should work
for (f in dir()){
assign(f, readGDAL(f))
}
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Sep 12, 2010, at 4:29 PM, Martin Brandt wrote:
a simple question:
how can I
This is neat!
On Sep 12, 2010, at 5:18 PM, Robert J. Hijmans wrote:
You have not said what type of objects you want, but here's one
option:
library(raster)
s - stack(list.files(pattern='*.tif'))
Robert
On Sun, Sep 12, 2010 at 10:29 PM, Martin Brandt
martin_bra...@gmx.net wrote:
a
Look at
knearneigh in spdep
Once you figured out the neighbours, you may be able to an algorithm
to efficiently partition the dataset.
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Aug 26, 2010, at 8:50 AM, Sven Schmiedel
You have a typo.
It is SpatialPixelsDataFrame. note the s
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Aug 25, 2010, at 4:43 AM, Dorothea Lemke wrote:
Dear list,
I have problems to coerce a SpatialGridDataFrame object
, the
correct use of weights really depends on the assumptions and structure
of the spatial process.
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Aug 23, 2010, at 8:59 AM, Breitbach, Nils wrote:
Dear Roger, dear Community,
thanks
big file and then construct the poly list. you may run
into memory issues for this operation, depending on your set up.
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Aug 20, 2010, at 1:06 PM, Sharon O'Donnell wrote:
Check out
Just issue the command once in the session.
gpclibPermit()
Alternatively, you could wait for the rgeos package.
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Aug 19, 2010, at 7:12 AM, Breitbach, Nils wrote:
Dear Community
image(meuse.grid)
image(meuse.grid[20:70, 10:70, dist], add = TRUE, col = bpy.colors())
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Aug 13, 2010, at 8:10 AM, Patrick Giraudoux wrote:
Hi,
I am trying to subset a SpatialGridDataFrame
(rrt, seq(0,1,1/7))
cols - grey((length(brks):2)/length(brks))
dens - (2:length(brks))*3
plot(nc, density=dens[findInterval(rrt, brks, all.inside=TRUE)])
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
[[alternative HTML version
(shapes/fylk-val.shp,
package=maptools)[1],
proj4string=CRS(+proj=utm +zone=33 +datum=WGS84))
a - coordinates(xx)
sl - lapply(a, slopes)
ag - lapply(sl, angles)
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Jul 30, 2010, at 3:33
try readOGR in rgdal package.
If you are using a mac, installing rgdal is slightly more complicated.
http://www.kyngchaos.com/software:frameworks
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Jun 30, 2010, at 5:44 AM, Mario
parallelization by breaking up the polygon files multiple
parts and then assembling them back, but if you really need the
accurate proportion of cell area of a cell that falls across two
polygons, this strategy wont work.
http://starspan.projects.atlas.ca.gov/doku/doku.php
Nikhil Kaza
Asst
I second that you should reconsider weights argument and zonal
statistics are much faster.
In case you wanted starspan download here it is
http://projects.atlas.ca.gov/frs/?group_id=48
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l
Not a R solution. But does v.generalize in grass help?
http://grass.osgeo.org/wiki/V.generalize_tutorial
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
On Jun 12, 2010, at 8:05 PM, Don MacQueen wrote:
I have an input shapefile
Look at this. Not sure if this is indeed what you want or if you
actually have to unproject them.
http://www.mail-archive.com/r-sig-geo@stat.math.ethz.ch/msg04715.html
require(ggplot2)
fortify(br)
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l
Take a look at this document
http://geodacenter.asu.edu/system/files/spdepintro.pdf
The standard steps are
require(maptools)
readShapepoly
require(spdep)
poly2nb
nb2listw or nb2mat
Nikhil Kaza
Asst. Professor,
City and Regional Planning
University of North Carolina
nikhil.l...@gmail.com
I am using theR -2.11 prerelase on windows 7 x64. I want to bring to
attention couple of issues to the list in case they have not been reported.
I understand that the R version is unstable, nevertheless here it is.
library(rgdal)
--
Error in registerS3method(Info[i, 1], Info[i, 2], Info[i, 3],
Roger,
Happy to report that methods issue is resolved in the R 2.11 beta
version.
spam is still an issue but I presume once Reinhard fixes it by Apr 22,
it should be fine.
Thanks
Nikhil
On Apr 12, 2010, at 3:43 PM, Roger Bivand wrote:
On Mon, 12 Apr 2010, nikhil kaza wrote:
I am
Your question would be better answered on r-sig-Geo list.
Nevertheless, here is the solution
neigh.dist - nbdists(neigh.nb, coords, longlat=TRUE)
inverse - lapply(neigh.dist, function(x) (1/(x^2)))
Now instead use,
neigh.listw - nb2listw(neigh.dist, glist=inverse,
Hello,
I am not sure if this is the right forum to ask as this is mostly a
sparse matrix question, nevertheless here it is.
I am using R - 2.10.1 and spdep 0.4-54 on Windows Vista
I have a large shapefile for which I need to create a neighborhood
matrix file, I used the following command
Many thanks!
I forgot about the row standardisation. I will subset the nb class and then
create the weights matrix.
Nikhil
On Thu, Feb 18, 2010 at 8:36 AM, Roger Bivand roger.biv...@nhh.no wrote:
On Thu, 18 Feb 2010, Nikhil Kaza wrote:
Hello,
I am not sure if this is the right forum
Look at this website.
http://www.carsonfarmer.com/?p=455
On 27 Nov 2009, at 11:03PM, rusers.sh wrote:
Dear Robert,
My method to generate the Voronoi tessellation maybe not better, You
can
show me you method to get it.
What i want to get is the the class of SpatialPolygons(sp) based on
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